Chemical composition analysis spectrometer based on liquid friction and analytical method thereof

Abstract

A chemical composition analysis spectrometer based on liquid friction and analysis method thereof, the spectrometer includes a plurality of electrodes arranged in an array, at least one layer of insulating film disposed over the plurality of electrodes, a current collection module, and a data processing module. The current collection module is configured to collect ground current data generated by each of the electrodes. The data processing module is configured to: (a) determine the triboelectric charge amount of the liquid droplet, and generate a position-charge quantity response curve; (b) obtain multiple corresponding spectrum matching degrees; and (c) identify a solution sample in the database with the highest spectrum matching degree, and determine chemical composition, ion species, chemical valence state, and concentration information of the liquid droplet. The spectrometer offers the advantages of a simple structure, low usage costs, portability and ease of maintenance.

What is claimed is: 
     
         1 . A chemical composition analysis spectrometer based on liquid friction, comprising:
 a plurality of electrodes arranged in an array;   at least one layer of insulating film disposed over the plurality of electrodes, wherein when a liquid droplet to be tested slides on an upper surface of the insulating film along the arrangement direction of the plurality of electrodes, the liquid droplet sequentially generates triboelectric charging with the surface of the insulating film on each of the electrodes, thereby inducing a corresponding ground current in each of the electrodes;   a current collection module configured to collect ground current data generated by each of the electrodes; and   a data processing module configured to:
 (a) determine the triboelectric charge amount of the liquid droplet at different positions on the insulating film along the arrangement direction, based on the arrangement positions of the electrodes and their corresponding ground current data, and generate a position-charge quantity response curve as a measured triboelectric chemical spectrum of the liquid droplet; 
 (b) compare the measured triboelectric chemical spectrum with the standard triboelectric chemical spectra of multiple solution samples in a database, and sequentially obtain multiple corresponding spectrum matching degrees; wherein the multiple solution samples have different chemical compositions, chemical valence states, and/or concentrations; and 
 (c) identify a solution sample in the database with the highest spectrum matching degree to the measured triboelectric chemical spectrum, and determine chemical composition, ion species, chemical valence state, and concentration information of the liquid droplet based on the chemical information of the solution sample. 
   
     
     
         2 . The spectrometer according to  claim 1 , wherein each of the electrodes comprises a material selected from the group consisting of copper film, aluminum film, and gold film. 
     
     
         3 . The spectrometer according to  claim 1 , wherein the plurality of electrodes is arranged in a linear array configuration, wherein the orientation of the linear array is inclined relative to a horizontal plane. 
     
     
         4 . The spectrometer according to  claim 1 , wherein each of the electrodes is characterized by a thickness in a range of 0.1 μm to 1 mm, a length in a range of 1 mm to 100 cm, and a width in a range of 1 mm to 10 cm. 
     
     
         5 . The spectrometer according to  claim 1 , wherein the width direction of the electrodes is parallel to the direction of the linear array; the plurality of electrodes is arranged in a parallel and equally spaced configuration with a spacing in a range of 1 mm to 100 cm. 
     
     
         6 . The spectrometer according to  claim 5 , wherein each of the electrodes has a cross-sectional shape perpendicular to the direction of the linear array, wherein the cross-sectional shape is one of a rectangle, a “V” shape, a “U” shape, and a circular ring. 
     
     
         7 . The spectrometer according to  claim 1 , wherein the plurality of electrodes is arranged in a circumferential array configuration and fixed to a roller; the insulating film is disposed on an inner wall of the roller and in contact with the plurality of electrodes. 
     
     
         8 . The spectrometer according to  claim 7 , wherein the spectrometer further comprising:
 a driving member configured to drive the roller to rotate about its central axis.   
     
     
         9 . The spectrometer according to  claim 1 , wherein the insulating film is formed from one of polytetrafluoroethylene, perfluoroethylene propylene copolymer, nylon, and polymethyl methacrylate, and has a thickness in a range of 1 μm to 1 mm. 
     
     
         10 . A chemical composition analysis spectrometer based on liquid friction, comprising:
 a plurality of electrodes arranged in an array; each of the electrodes comprises a material selected from the group consisting of copper film, aluminum film, and gold film;   the plurality of electrodes is arranged in a circumferential array configuration and fixed to a roller;   at least one layer of insulating film disposed over the plurality of electrodes, wherein when a liquid droplet to be tested slides on an upper surface of the insulating film along the arrangement direction of the plurality of electrodes, the liquid droplet sequentially generates triboelectric charging with the surface of the insulating film on each of the electrodes, thereby inducing a corresponding ground current in each of the electrodes; the insulating film is disposed on an inner wall of the roller and in contact with the plurality of electrodes;   a driving member configured to drive the roller to rotate about its central axis;   a current collection module configured to collect ground current data generated by each of the electrodes; and   a data processing module configured to:
 (a) determine the triboelectric charge amount of the liquid droplet at different positions on the insulating film along the arrangement direction, based on the arrangement positions of the electrodes and their corresponding ground current data, and generate a position-charge quantity response curve as a measured triboelectric chemical spectrum of the liquid droplet; 
 (b) compare the measured triboelectric chemical spectrum with the standard triboelectric chemical spectra of multiple solution samples in a database, and sequentially obtain multiple corresponding spectrum matching degrees; wherein the multiple solution samples have different chemical compositions, chemical valence states, and/or concentrations; and 
 (c) identify a solution sample in the database with the highest spectrum matching degree to the measured triboelectric chemical spectrum, and determine chemical composition, ion species, chemical valence state, and concentration information of the liquid droplet based on the chemical information of the solution sample. 
   
     
     
         11 . The spectrometer according to  claim 10 , wherein the insulating film is formed from one of polytetrafluoroethylene, perfluoroethylene propylene copolymer, nylon, and polymethyl methacrylate, and has a thickness in a range of 1 μm to 1 mm. 
     
     
         12 . The spectrometer according to  claim 10 , wherein each of the electrodes is characterized by a thickness in a range of 0.1 μm to 1 mm, a length in a range of 1 mm to 100 cm, and a width in a range of 1 mm to 10 cm. 
     
     
         13 . A chemical composition analysis method based on liquid friction, characterized in that the method is applied to the spectrometer according to  claim 1 ; the analysis method comprises the following steps:
 S 1 : acquiring the ground current data generated by each of the electrodes when the liquid droplet slides on the upper surface of the insulating film;   S 2 : determining the triboelectric charge amount of the liquid droplet at different positions on the insulating film along the arrangement direction, based on the arrangement positions of the electrodes and their corresponding ground current data, and generating a position-charge quantity response curve as a measured triboelectric chemical spectrum of the liquid droplet;   S 3 : comparing the measured triboelectric chemical spectrum with the standard triboelectric chemical spectra of multiple solution samples in a database to obtain multiple corresponding spectrum matching degrees; wherein the multiple solution samples have different chemical compositions, chemical valence states, and/or concentrations; and   S 4 : identifying a solution sample in the database with the highest spectrum matching degree to the measured triboelectric chemical spectrum, and determining chemical composition, ion species, chemical valence state, and concentration information of the liquid droplet based on the chemical information of the solution sample.   
     
     
         14 . The analysis method according to  claim 13 , wherein the database is preconstructed by a method comprising:
 preparing a plurality of solution samples with specific chemical information according to analysis requirements, wherein the plurality of solution samples have different chemical compositions, chemical valence states, and/or concentrations; and   conducting multiple liquid droplets triboelectric charging tests on each of the solution samples in accordance with the method described in steps S 1  to S 2 , obtaining multiple sets of triboelectric chemical spectra for each solution sample, fitting the multiple sets of triboelectric chemical spectra into a standard triboelectric chemical spectrum for each solution sample, and constructing the database based on the specific chemical information and the standard triboelectric chemical spectra of the plurality of solution samples.   
     
     
         15 . The analysis method according to  claim 13 , wherein in step S 3 , the comparison items comprise the position, peak height, and peak width of characteristic peaks. 
     
     
         16 . The analysis method according to  claim 13 , wherein each of the electrodes comprises a material selected from the group consisting of copper film, aluminum film, and gold film; the plurality of electrodes is arranged in a linear array configuration, wherein the orientation of the linear array is inclined relative to a horizontal plane. 
     
     
         17 . The analysis method according to  claim 13 , wherein each of the electrodes is characterized by a thickness in a range of 0.1 μm to 1 mm, a length in a range of 1 mm to 100 cm, and a width in a range of 1 mm to 10 cm; the width direction of the electrodes is parallel to the direction of the linear array; the plurality of electrodes is arranged in a parallel and equally spaced configuration with a spacing in a range of 1 mm to 100 cm. 
     
     
         18 . The analysis method according to  claim 13 , wherein each of the electrodes has a cross-sectional shape perpendicular to the direction of the linear array, wherein the cross-sectional shape is one of a rectangle, a “V” shape, a “U” shape, and a circular ring. 
     
     
         19 . The analysis method according to  claim 13 , wherein the plurality of electrodes is arranged in a circumferential array configuration and fixed to a roller; the insulating film is disposed on an inner wall of the roller and in contact with the plurality of electrodes;
 the spectrometer further comprises a driving member configured to drive the roller to rotate about its central axis.   
     
     
         20 . The analysis method according to  claim 13 , wherein the insulating film is formed from one of polytetrafluoroethylene, perfluoroethylene propylene copolymer, nylon, and polymethyl methacrylate, and has a thickness in a range of 1 μm to 1 mm.